chesebro



D. P. CHESEBRO.

SCAFFOLDING DEVICE.

APPLICATION FILED JUNE 6. 1914.

Patent-ed Aug. 29, 1916.

UNITED STATES PATENT onnion.

DENISON P. CHESEBRO, OF NEW ROCHELLE, NEW YORK, ASSIGNOR TO AMERICANSAFETY DEVICE COMPANY, A CORPORATION OF NEW YORK.

SCAFFOLDIN G DEVICE.

Application filed June 6, 1914.

To all whom it may concern:

Be it known that I, DENISON P. CHESE- BRO, a citizen of the UnitedStates of America, and resident of New Rochelle, in the county ofWestchester and State of New York, have invented certain new and usefulImprovements in Scaffolding Devices, of which the following is aspecification.

This invention relates to scaffolding devices, and more particularly tothat kind intended to be applied to buildings of brick or masonry and ofthat kind of buildings which are about four, five or six stories inheight, in contradistinction to the taller buildings of eighteen ortwenty or more stories in height.

The object of the invention is to provide an improved scaffolding devicewhich is safe and efficient, and which is readily installed andoperated, and by means of which the workmen are enabled to graduallyascend along the walls of a building under construction. By the use ofthe'improved scaffolding device the use of the Wooden horses and woodenposts and platforms is done away with, which use has resulted in manyaccidents due to the insecure method in which these scaffolding devicesare arranged and built up.

The invention will be more fully described hereinafter and finallypointed out in the claims.

In the accompanying drawing, Figure 1 is a perspective view of myimproved scaffolding device, Fig. 2 is an end-view of the same, Fig. 3is a horizontal section taken on line 33 of Fig. 2, Fig. 4 is aplan-view, partly in section, taken on line H of Fig. 2, Fig. 5 is adetail side-view of a portion of the device, on a larger scale, and Fig.6 is a vertical section taken on line 66 of Fig. 2. v

Similar characters of reference indicate corresponding parts throughoutthe different figures of the drawing.

Referring to the drawing, and more particularly to Fig. 1, the posts 10are arranged along the walls of the building. The lower pole Or post hasits lower end inserted into the ground, and thereby stability is givento the post. The upper end of the lower post has another post joinedtherewith, as is clearly shown in Fig. 2, where theinteriorconnecting-rod 12 enters the sleeve 13, wh1ch sleeve forms the upper endof the lower Specification of Letters Patent.

Patented Aug. 29, 1916.

Serial No. 843,384.

post. Along the length of the post, either above or below the operatingmechanism, braces 15 are arranged, which have their ends 16 secured tothe posts by sleeves 18 and pins 19 in openings 22 in the posts. Bymeans of the braces stability is given to the posts throughout theirheight. In order to indicate that the structure is arranged post on postto any suitable height, the parts are shown broken away at 17, in Fig.l.

The operating mechanism comprises a sleeve 20, which is temporarilysecured to the post by means of a pin 21 passing through the openings'22 in the post, and this sleeve 20 is provided with an extending flange24 having an opening through which a vertical screw-threaded spindle 25passes.

This spindle is engaged by a threaded ratchet-wrench 27 of the usualtype, and not necessary to be described in detail. When the handle 28 ofthe wrench is reciprocated, the spindle is thereby lifted through theflange 2A1. The lower end of the spindle 25 is pivoted at 29 to across-bar 30, which in turn is pivotally connected at 3l to the flanges32 of a sleeve 33, which is freely slidable on the posts. A ratchetlocking device 35 is secured to the bar 30, and engages openings 37 inthe posts and permits the bar 30 to be raised, but prevents the samefrom descending, unless the said-locking device is released. A suitableplatform of boards, indicated by 39, is arranged transversely to thebars 30 upon the same, and

the platform may be gradually raised the length of the spindles, andwhen the platform reaches the upper limit of movement of the spindlesthe locking device 35 holds the platform in position. The pins 21 arethen removed, and the handles 28 are manipulated to move the ratchets 27upwardly along the spindle. The sleeves 20, with the bolts 21, are thenraised to the upper portions of the spindles, and the bolts againinserted through the sleeves and the higher openings in the posts. Thesame manipulation is repeated as often as necessary. By this means theplatform may be raised from the lowermost portion of the posts to theuppermost portion of the uppermost post, corresponding to the intendedheight of the building.

I claim:

1. In a scaffolding device having adjacent pairs of posts arrangedparallel to the wall of the building, a platform supporting unit adaptedto be raised and lowered, comprising lower slidable sleeves, adapted toengage each of said posts, a cross-bar pivotally connected at its endsto the said lower slidable sleeves, upper slidable sleeves adapted toengage each of said posts, means for securing said sleeves at fixedpoints on the said sleeves, laterally extending flanges on the saidupper, slidable sleeves, provided with openings therethrough, threadedspindles pivotally secured at each side of said cross-rods, andextending upwardly through the said flanges of the upper slidablesleeves,

and independently operable means engaging the said spindles above thesaid flanges adapted to move the said spindles through the said flanges.

2. In a scaflolding device having adjacent pairs of posts arrangedparallel to the Wall of the building, a platform supporting unit adaptedto be raised and lowered, comprising lower slidable sleeves, adapted toengage each of said posts, a cross-bar pivotally connected at its endsto the said lower slidable sleeves, upper slidable sleeves adapted toengage each of said posts, means for securing said sleeves at fixedpoints on the said sleeves, laterally extending flanges on the saidupper slidable sleeves, provided with openings therethrough, threadedspindles pivotally secured at each side of said crossrods, and extendingupwardly through the said flanges of the upper slidable sleeves andindependently operable means engaging the said spindles above the saidflanges adapted to move the said spindles through the said flanges, anda supporting device connected with the cross-bar, and adapted to engageone of the posts.

3. In a scaifolding device having adjacent pairs of posts arrangedparallel to the wall of the building, one of said posts being providedwith a series of holes therein, a platform supporting unit adapted to beraised and lowered, comprising lower slidable sleeves, adapted to engageeach of said posts, a crossbar pivotally connected at its ends to thesaid lower slidable sleeves, upper slidable sleeves adapted to engageeach of said posts, means for securing said sleeves at fixed points onthe said posts, laterally extending flanges on the said upper slidablesleeves, provided with openings therethrough, threaded spindlespivotally secured at each side of the said orossrods, and extendingupwardly through the said flanges of the upper slidable sleeves,independently operable means engaging the said spindles above the saidflanges, adapted to move the said spindles through the said flanges, anda pivotally mounted weighted supporting device at one side of saidcross-bar, adapted to automatically engage and be disengaged from thesaid openings of the post as the platform supporting unit is raised.

In testimony, that I claim the foregoing as my invention, I have signedmy name in presence of two subscribing witnesses.

DENISON P. CHESEBRO.

Witnesses:

, F. Hose,

Jos'. BISBAND. v

